US4172920A - Pigment coated phosphor - Google Patents

Pigment coated phosphor Download PDF

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Publication number
US4172920A
US4172920A US05/900,855 US90085578A US4172920A US 4172920 A US4172920 A US 4172920A US 90085578 A US90085578 A US 90085578A US 4172920 A US4172920 A US 4172920A
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United States
Prior art keywords
phosphor
pigment
pigment coated
green emitting
pigment particles
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Expired - Lifetime
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US05/900,855
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English (en)
Inventor
Katuzo Kanda
Noboru Kotera
Shusaku Eguchi
Hidenaga Horiuchi
Kazuhito Iwasaki
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Dai Nippon Toryo KK
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Dai Nippon Toryo KK
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated
    • Y10T428/2993—Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]

Definitions

  • This invention relates to a phosphor coated with pigment particles (hereinafter referred to as "pigment coated phosphor”), and more particularly to a pigment coated phosphor employed in a high contrast color television cathode ray tube.
  • pigment particles adhering to the surfaces of phosphor particles such as blue emitting phosphor particles, green emitting phosphor particles and red emitting phosphor particles employed in a color television cathode ray tube markedly enhance the contrast of the image formed on the cathode ray tube. This is because a part of the visible region of the emission spectra inherent in the phosphor is cut due to the filter effect of the pigment particles adhering thereto, which results in a clearer emission color, and further because the pigment particles can absorb a part of the external light to reduce the reflection of light thereby. This is disclosed, for instance in U.S. Pat. No. 3,886,394.
  • the reflectance be low and the luminance be sufficiently high. That is, in order to lower the reflectance of the external light by the pigment coated phosphor, it is necessary to increase the amount of the pigment particles adhering to the surface of the phosphor and obtain a higher surface coating rate. In such a pigment coated phosphor having a high surface coating rate, the luminance thereof is inevitably lowered. It is required that the lowering of the luminance be controlled to be as small as possible. In other words, for a given specific reflectance, the luminance is desired to be as high as possible.
  • chromium oxide (Cr 2 O 3 ) have been recommended as green pigment particles for a green pigment coated green emitting phosphor employed in a high contrast color television cathode ray tube.
  • the pigment coated phosphor using the chromium oxide pigment particles satisfies the aforesaid requirement to some extent, but not sufficiently. Therefore, it has not been put into practical use. That is, at present, blue and red pigment coated phosphors are used respectively as the blue and red emitting phosphors of a high contrast color television cathode ray tube, but a green pigment coated phosphor is not used as the green emitting phosphor thereof.
  • the object of the present invention is to provide a green pigment coated green emitting phosphor whose luminance is higher, when comparing phosphors of the same specific reflectance, than that of the conventional chromium oxide pigment coated green emitting phosphor.
  • the pigment coated phosphor in accordance with the present invention is characterized in that the TiO 2 --ZnO--CoO--NiO system pigment particles adhere to the surface of a green emitting phosphor.
  • FIG. 1 represents the reflection spectra of the TiO 2 --ZnO--CoO--NiO system pigment particles employed in the pigment coated phosphor of the present invention (curve-a) and the chromium oxide pigment particles employed in the conventional pigment coated phosphor (curve-b), and
  • FIG. 2 represents the relationship between the specific reflectance and the luminance of the pigment coated phosphor of the present invention wherein TiO 2 --ZnO--CoO--NiO system pigment particles adhere to the surface of the ZnS:Cu,Al phosphor (curve-a) and that of the conventional pigment coated phosphor wherein chromium oxide pigment particles adhere to the surface of the same ZnS:Cu,Al phosphor (curve-b).
  • TiO 2 --ZnO--CoO--NiO system pigment particles used in the pigment coated phosphor of the present invention there are employed commercially available products.
  • the TiO 2 --ZnO--CoO--NiO system pigment contains titanium dioxide (TiO 2 ), zinc oxide (ZnO), cobalt oxide (CoO) and nickel oxide (NiO) as main ingredients.
  • the body color of the TiO 2 --ZnO--CoO--NiO system pigment varies depending upon the method of production, particle size, contents of the aforesaid main ingredients, and the like.
  • the reflectances at 400 nm, 450 nm, 500 nm, 550 nm, 600 nm, 650 nm and 700 nm of the TiO 2 --ZnO--CoO--NiO system pigment particles employed in the pigment coated phosphor of the present invention are within the ranges indicated in Table I below wherein the reflectance is shown by a relative value with reference to that of a magnesium oxide diffusion plate defined to be 100%.
  • FIG. 1 represents the reflection spectrum of the TiO 2 --ZnO--CoO--NiO system pigment particles employed in the pigment coated phosphor of the present invention (curve-a) in comparison with that of the chromium oxide pigment particles employed in the conventional pigment coated phosphor (curve-b) wherein the reflectance represented by the ordinate is also shown by a relative value with reference to that of a magnesium oxide diffusion plate defined to be 100%.
  • the TiO 2 --ZnO--CoO--NiO system pigment particles employed in the pigment coated phosphor of the present invention should preferably have a mean particle size of less than 3.0 ⁇ .
  • the TiO 2 --ZnO--CoO--NiO system pigment particles having a mean particle size larger than 3.0 ⁇ are employed, the pigment particles do not firmly adhere to the surface of the phosphor since the pigment particles are too large. Therefore, when using large particles a larger amount of the pigment particles is needed to effect a desired coloration of the phosphor, which marked lowers the luminance of the pigment coated phosphor obtained.
  • the mean particle size is within a range of 0.1 ⁇ to 1.5 ⁇ .
  • the green emitting phosphors employed in the pigment coated phosphor of the present invention are, for example, a copper activated zinc sulfide phosphor (ZnS:Cu), a copper and aluminium activated zinc sulfide phosphor (ZnS:Cu,Al), a copper activated zinc cadmium sulfide phosphor [(Zn,Cd)S:Cu], a copper and aluminum activated zinc cadmium sulfide phosphor [(Zn,Cd)S:Cu,Al], a silver activated zinc cadmium sulfide phosphor [(Zn,Cd)S:Ag], a silver and aluminium activated zinc cadmium sulfide phosphor [(Zn,Cd)S:Ag,Al], a gold and aluminium activated zinc sulfide phosphor (ZnS:Au,Al), a copper, gold and aluminium activated zinc sulfide phosphor (
  • the sulfide phosphors included in the above mentioned green emitting phosphors may contain a very small amount of halogen, bismuth, antimony, and the like.
  • the ZnS:Cu,Al phosphor and (Zn,Cd)S:Cu,Al phosphor which are practically used as the green emitting phosphors for a color television cathode ray tube are especially recommended.
  • These green emitting phosphors employed in the pigment coated phosphor of the present invention should preferably have a mean particle size within a range of 3 ⁇ to 15 ⁇ , more preferably of 4 ⁇ to 12 ⁇ .
  • the conventional process for preparing a pigment coated phosphor as disclosed in the aforesaid U.S. Pat. No. 3,886,394 may be adopted.
  • pigment particles dispersed in an appropriate solution of a water soluble resin such as polyvinyl pyrrolidone are mixed with a phosphor dispersed in an aqueous solution of gelatin, and then the mixture is stirred and the resulting precipitate is dried to obtain a pigment coated phosphor.
  • the pigment particles adhere uniformly and firmly to the surface of the phosphor.
  • a process for having the pigment particles adhere to the surface of the phosphor uniformly and firmly are recommended, for instance, a process utilizing a suspension polymerization method, a process utilizing a copolymerization method and a process using a gelatin-gum arabic mixture as a binder.
  • the amount of the TiO 2 --ZnO--CoO--NiO system pigment particles adhering to the surface of the green emitting phosphor is preferably within a range of 0.02 to 10 parts by weight per 100 parts by weight of the green emitting phosphor, though it depends upon various factors such as the kind of the green emitting phosphor employed, the particle size thereof, the kind of the TiO 2 --ZnO--CoO--NiO system pigment particles employed and the particle size thereof.
  • the amount of the pigment particles is not more then 0.02 parts, it is impossible to obtain a sufficiently high contrast, while when it is not less than 10 parts, the luminance is lowered.
  • FIG. 2 represents the relationship between the specific reflectance and the luminance of the pigment coated phosphor of the present invention wherein TiO 2 --ZnO--CoO--NiO system pigment particles adhere to the surface of the ZnS:Cu,Al phosphor (curve-a) in comparison with that of the conventional pigment coated phosphor wherein chromium oxide pigment particles adhere to the surface of the same ZnS:Cu,Al phosphor (curve-b).
  • the luminance represented by the ordinate is shown by a relative value with reference to that of the uncoated ZnS:Cu,Al phosphor defined to be 100%.
  • the luminance of the pigment coated phosphor of the present invention is always higher, when comparing phosphors of the same specific reflectance, than that of the conventional pigment coated phosphor.
  • the relationship between the specific reflectance and the luminance of the pigment coated phosphor of the present invention using a green emitting phosphor varies depending upon the kind of the TiO 2 --ZnO--CoO--NiO system pigment particles employed and the particle size thereof, the result of the experiments indicates that, within the range of the practical specific reflectance, the pigment coated phosphor of the present invention exhibits higher luminance, when comparing phosphors of the same specific reflectance, than that of the conventional pigment coated phosphor using chromium oxide pigment particles.
  • a pigment coated phosphor whose luminance is higher, when comparing phosphors of the same specific reflectance, than that of the conventional pigment coated phosphor.
  • the pigment coated phosphor of the present invention is used mainly as a green emitting phosphor for a high contrast color television cathode ray tube.
  • the use thereof is not limited only to the green emitting phosphor for a high contrast color television cathode ray tube.
  • the phosphor dispersion and the pigment dispersion were mixed by stirring.
  • the pH of the resulting mixture was adjusted to 4.0 and the temperature thereof was lowered to below 10° C.
  • To the mixture was then added gradually 1 part by weight of formaline while the mixture was continuously stirred. After the mixture was allowed to stand, a precipitate was obtained.
  • the supernatant solution was removed and the precipitate was washed with water.
  • the precipitate was then separated from water and concentrated using a decanter to yield a pigment coated phosphor cake containing about 85% of solid content. The cake was dried in a stream of air to obtain a pigment coated phosphor of the present invention.
  • the conventional pigment coated phosphor using chromium oxide pigment particles was prepared in the same manner as that mentioned above except 0.15 parts by weight of chromium oxide pigment particles having a mean particle size of about 0.5 ⁇ (X-1134, made by Hercules Co., Ltd.) were used instead of the aforesaid 0.2 parts by weight of TiO 2 --ZnO--CoO--NiO system pigment particles.
  • the specific reflectance of the pigment coated phosphor of the present invention obtained was almost the same as that of the conventional pigment coated phosphor. However, the luminance thereof was higher than that of the conventional one.
  • the phosphor dispersion and the pigment dispersion were mixed by stirring.
  • the pH of the resulting mixture was adjusted to 4.0 and the temperature thereof was lowered to below 10° C.
  • To the mixture was then added gradually 1 part by weight of formaline while the mixture was continuously stirred. After the mixture was allowed to stand, a precipitate was obtained.
  • the supernatant solution was removed and the precipitate was washed with water.
  • the precipitate was then separated from water and concentrated using a decanter to yield a pigment coated phosphor cake containing about 85% of solid content. The cake was dried in a stream of air to obtain a pigment coated phosphor of the present invention.
  • the conventional pigment coated phosphor using chromium oxide pigment particles was prepared in the same manner as that mentioned above except 0.25 parts by weight of chromium oxide pigment particles having a mean particle size of about 0.5 ⁇ (X-1134, made by Hercules Co., Ltd.) were used instead of the aforesaid 0.3 parts by weight of TiO 2 --ZnO--CoO--NiO system pigment particles.
  • the specific reflectance of the pigment coated phosphor of the present invention obtained was almost the same as that of the conventional pigment coated phosphor. However, the luminance thereof was higher than that of the conventional one.
  • the phosphor dispersion and the pigment dispersion were mixed by stirring.
  • the pH of the resulting mixture was adjusted to 4.0 and the temperature thereof was lowered to below 10° C.
  • To the mixture was then added gradually 1 part by weight of formaline while the mixture was continuously stirred. After the mixture was allowed to stand, a precipitate was obtained.
  • the supernatant solution was removed and the precipitate was washed with water.
  • the precipitate was then separated from water and concentrated using a decanter to yield a pigment coated phosphor cake containing about 85% of solid content. The cake was dried in a stream of air to obtain a pigment coated phosphor of the present invention.
  • the conventional pigment coated phosphor using chromium oxide pigment particles was prepared in the same manner as that mentioned above except 0.35 parts by weight of chromium oxide pigment particles having a mean particle size of about 0.5 ⁇ (X-1134, made by Hercules Co., Ltd.) were used instead of the aforesaid 0.5 parts by weight of TiO 2 --ZnO--CoO--NiO system pigment particles.
  • the specific reflectance of the pigment coated phosphor of the present invention obtained was almost the same as that of the conventional pigment coated phosphor. However, the luminance thereof was higher than that of the conventional one.
  • the phosphor-pigment dispersion was continuously mixed with water in a mixing weight ratio of 1 part of the dispersion: 10 parts of water using a linemixer.
  • the solvent ethanol
  • the precipitate was then taken out and concentrated using a decanter to yield a pigment coated phosphor cake containing about 85% of solid content.
  • the cake was dried in a stream of air to obtain a pigment coated phosphor of the present invention.
  • the conventional pigment coated phosphor was prepared in the same manner as that mentioned above except 0.65 parts by weight of chromium oxide pigment particles having a mean particle size of about 0.5 ⁇ (X-1134, made by Hercules Co., Ltd.) were used instead of the aforesaid 0.8 parts by weight of TiO 2 --ZnO--CoO--NiO system pigment particles.
  • the specific reflectance of the pigment coated phosphor of the present invention obtained was almost the same as that of the conventional pigment coated phosphor. However, the luminance thereof was higher than that of the conventional one.
  • a copper and aluminium activated zinc sulfide phosphor (ZnS:Cu,Al) having a mean particle size of 10 ⁇ was prepared as a green emitting phosphor.
  • TiO 2 --ZnO--CoO--NiO system pigment particles having a mean particle size of about 0.5 were dispersed uniformly in a nitrocellulosealkyd resin solution (DNT clear lacquer, made by Dai Nippon Toryo Co., Ltd.) by a ball mill. A pigment particle dispersed adhesive solution was thus obtained.
  • the ingredients of the resulting pigment particle dispersed adhesive solution and the amount of the ingredients were as follows.
  • the aforesaid green emitting phosphor was put into a tank of an electrostatic coating machine (made by Ransburg Co., Ltd.), and the machine was prepared to charge the green emitting phosphor particles sprayed into positive polarity.
  • the aforesaid pigment particle dispersed adhesive solution was put into a tank of another electrostatic coating machine (White Dragon, made by Nippon Kogei Co., Ltd.), and the machine was prepared to charge the microdrops of the solution sprayed into negative polarity.
  • the voltage of the electrostatic generators of the coating machines was adjusted to 7 kilovolts, and the pressure of the air spouted from the compressors of the coating machines was adjusted to 4 Kg/cm.
  • Spray guns for the green emitting phosphor and the pigment particle dispersed adhesive solution were located so that the distance between the tops of the guns was 20 cm and the angle between the directions in which the phosphor particles and the microdrops of solution were sprayed respectively by the guns was 60°.
  • the green emitting phosphor and the pigment particle dispersed adhesive solution were sprayed into a cyclone maintained at a temperature ranging from 20 to 30° C. at the rate of 100 g/minute and 18 g/minute, respectively.
  • the microdrops of the pigment particle dispersed adhesive solution was caused to adhere to the surface of the green emitting phosphor, and a pigment coated phosphor having a uniform coating of pigment particles dropped down on the bottom of the cyclone.
  • the pigment coated phosphor of the present invention was obtained.
  • the conventional pigment coated phosphor using chromium oxide pigment particles was prepared in the same manner as that mentioned above except 0.6 parts by weight of chromium oxide pigment particles having a mean particle size of about 0.5 ⁇ (X-1134, made by Hercules Co., Ltd.) were used instead of the aforesaid 0.8 parts by weight of TiO 2 --ZnO--CoO--NiO system pigment particles.
  • the specific reflectance of the pigment coated phosphor of the present invention was almost the same as that of the conventional pigment coated phosphor. However, the luminance thereof was higher than that of the conventional one.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Luminescent Compositions (AREA)
  • Pigments, Carbon Blacks, Or Wood Stains (AREA)
US05/900,855 1977-05-04 1978-04-28 Pigment coated phosphor Expired - Lifetime US4172920A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP52051389A JPS5827832B2 (ja) 1977-05-04 1977-05-04 顔料付螢光体
JP52-51389 1977-05-04

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US (1) US4172920A (nl)
JP (1) JPS5827832B2 (nl)
DE (1) DE2819342C2 (nl)
GB (1) GB1576680A (nl)
NL (1) NL190242C (nl)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041339A1 (en) * 1980-05-29 1981-12-09 Mitsubishi Denki Kabushiki Kaisha Color cathode ray tube
US4440831A (en) * 1981-06-30 1984-04-03 International Business Machines Corporation Zinc silicate phosphor particles and method for making them
US4772818A (en) * 1985-10-21 1988-09-20 Kabushiki Kaisha Toshiba Cathode ray tube with pigment-doped phosphor
US5041334A (en) * 1989-08-25 1991-08-20 Nichia Kagaku Kogyo K.K. Pigment-attached phosphor
US5166577A (en) * 1990-05-29 1992-11-24 Mitsubishi Denki Kabushiki Kaisha Projection cathode-ray tube with interference film
US5672405A (en) * 1996-02-26 1997-09-30 Plank, Jr.; J. Lee Metal-reinforced molded-plastic composite structures
US6077458A (en) * 1994-09-20 2000-06-20 Hitachi, Ltd. Phosphor, and cathode-ray tube and display using the same
US6692660B2 (en) 2001-04-26 2004-02-17 Nanogram Corporation High luminescence phosphor particles and related particle compositions
US20040043141A1 (en) * 2002-06-20 2004-03-04 Takahiro Igarashi Coated particles and coating method
US20050006626A1 (en) * 2003-07-10 2005-01-13 Lee Keun Pil Fluorescent substance for display device
US20050118411A1 (en) * 2001-08-17 2005-06-02 Nanogram Corporation Optical materials and optical devices
US20060132020A1 (en) * 1997-10-31 2006-06-22 Nanogram Corporation Phosphors
US7423512B1 (en) 1997-10-31 2008-09-09 Nanogram Corporation Zinc oxide particles
US7507382B2 (en) 1999-03-10 2009-03-24 Nanogram Corporation Multiple reactant nozzles for a flowing reactor
US20090258200A1 (en) * 2005-10-05 2009-10-15 Ulrich Scholz Securing the Authenticity of Value Documents By Means of Characteristic Substances

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0821334B2 (ja) * 1981-03-20 1996-03-04 株式会社日立製作所 カラー受像管
JPH06310061A (ja) * 1993-02-26 1994-11-04 Sony Corp 表示装置
DE69620516T2 (de) * 1995-07-24 2002-11-07 Toshiba Kawasaki Kk Farbbildröhre
USRE37750E1 (en) 1995-07-24 2002-06-18 Kabushiki Kaisha Toshiba CRT having color filter with a special green filter

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US2068294A (en) * 1931-02-07 1937-01-19 Ig Farbenindustrie Ag Inorganic colored pigment and a process of preparing the same
US3275466A (en) * 1965-05-03 1966-09-27 Rca Corp Method of adhering particles to a support surface
US3308326A (en) * 1966-05-19 1967-03-07 Zenith Radio Corp Color image reproducer having red phosphor combined with red-pass filter element
US3450550A (en) * 1966-02-25 1969-06-17 Du Pont Inorganic blue to green pigments
US3886394A (en) * 1973-09-04 1975-05-27 Rca Corp Image display employing filter coated phosphor particles
US4019905A (en) * 1974-06-17 1977-04-26 Hitachi, Ltd. Method for forming fluorescent screen of color cathode ray tubes using filter layer
US4020231A (en) * 1976-03-31 1977-04-26 Gte Sylvania Incorporated Pigmented phosphors and method of making
US4021588A (en) * 1976-01-23 1977-05-03 Rca Corporation Method for preparing filter-coated phosphor particles

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US3688394A (en) * 1971-05-20 1972-09-05 Philips Corp Method of making a deflection coil

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2068294A (en) * 1931-02-07 1937-01-19 Ig Farbenindustrie Ag Inorganic colored pigment and a process of preparing the same
US3275466A (en) * 1965-05-03 1966-09-27 Rca Corp Method of adhering particles to a support surface
US3450550A (en) * 1966-02-25 1969-06-17 Du Pont Inorganic blue to green pigments
US3308326A (en) * 1966-05-19 1967-03-07 Zenith Radio Corp Color image reproducer having red phosphor combined with red-pass filter element
US3886394A (en) * 1973-09-04 1975-05-27 Rca Corp Image display employing filter coated phosphor particles
US4019905A (en) * 1974-06-17 1977-04-26 Hitachi, Ltd. Method for forming fluorescent screen of color cathode ray tubes using filter layer
US4021588A (en) * 1976-01-23 1977-05-03 Rca Corporation Method for preparing filter-coated phosphor particles
US4020231A (en) * 1976-03-31 1977-04-26 Gte Sylvania Incorporated Pigmented phosphors and method of making

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0041339A1 (en) * 1980-05-29 1981-12-09 Mitsubishi Denki Kabushiki Kaisha Color cathode ray tube
US4405881A (en) * 1980-05-29 1983-09-20 Mitsubishi Denki Kabushiki Kaisha Color cathode ray tube including Nd2 O3 and Cr2 O3 in face glass
US4440831A (en) * 1981-06-30 1984-04-03 International Business Machines Corporation Zinc silicate phosphor particles and method for making them
US4772818A (en) * 1985-10-21 1988-09-20 Kabushiki Kaisha Toshiba Cathode ray tube with pigment-doped phosphor
US5041334A (en) * 1989-08-25 1991-08-20 Nichia Kagaku Kogyo K.K. Pigment-attached phosphor
US5166577A (en) * 1990-05-29 1992-11-24 Mitsubishi Denki Kabushiki Kaisha Projection cathode-ray tube with interference film
US6077458A (en) * 1994-09-20 2000-06-20 Hitachi, Ltd. Phosphor, and cathode-ray tube and display using the same
US5672405A (en) * 1996-02-26 1997-09-30 Plank, Jr.; J. Lee Metal-reinforced molded-plastic composite structures
US7132783B1 (en) 1997-10-31 2006-11-07 Nanogram Corporation Phosphor particles having specific distribution of average diameters
US20060132020A1 (en) * 1997-10-31 2006-06-22 Nanogram Corporation Phosphors
US7423512B1 (en) 1997-10-31 2008-09-09 Nanogram Corporation Zinc oxide particles
US7507382B2 (en) 1999-03-10 2009-03-24 Nanogram Corporation Multiple reactant nozzles for a flowing reactor
US6692660B2 (en) 2001-04-26 2004-02-17 Nanogram Corporation High luminescence phosphor particles and related particle compositions
US7101520B2 (en) 2001-04-26 2006-09-05 Nanogram Corporation High luminescence phosphor particles and methods for producing the particles
US7306845B2 (en) 2001-08-17 2007-12-11 Neophotonics Corporation Optical materials and optical devices
US20050118411A1 (en) * 2001-08-17 2005-06-02 Nanogram Corporation Optical materials and optical devices
US7776406B2 (en) 2001-08-17 2010-08-17 Neophotonics Corporation Optical materials and optical devices
US6913787B2 (en) * 2002-06-20 2005-07-05 Sony Corporation Coating particles by colliding larger fluidized particles to smaller slurry particles
US20040043141A1 (en) * 2002-06-20 2004-03-04 Takahiro Igarashi Coated particles and coating method
US7147890B2 (en) * 2002-06-20 2006-12-12 Sony Corporation Method for coating phosphor particles
US20050006626A1 (en) * 2003-07-10 2005-01-13 Lee Keun Pil Fluorescent substance for display device
US20090258200A1 (en) * 2005-10-05 2009-10-15 Ulrich Scholz Securing the Authenticity of Value Documents By Means of Characteristic Substances
US10836198B2 (en) 2005-10-05 2020-11-17 Giesecke+Devrient Currency Technology Gmbh Securing the authenticity of value documents by means of characteristic substances

Also Published As

Publication number Publication date
NL7804807A (nl) 1978-11-07
GB1576680A (en) 1980-10-15
NL190242B (nl) 1993-07-16
DE2819342A1 (de) 1978-11-09
NL190242C (nl) 1993-12-16
JPS5827832B2 (ja) 1983-06-11
JPS53136039A (en) 1978-11-28
DE2819342C2 (de) 1983-07-21

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